String Wound Filter

String wound filter is a core consumable widely used in the field of liquid pre-filtration and fine filtration. The core structure of the cartridge consists of layers of specific fiber yarns (e.g. polypropylene, cotton, glass fiber, polyester, etc.) wrapped around a porous skeleton (usually polypropylene or stainless steel) in accordance with precisely controlled winding densities and angles. This unique manufacturing process gives it excellent deep filtration capabilities.

1. The liquid to be filtered enters from outside the filter housing.
2. As it flows through the wound cartridge, impurity particles are intercepted layer by layer.
3. Larger particles are first captured by the loose structure of the outer layer of the cartridge.
4. As the liquid flows to the inside of the filter element, the winding density gradually increases, and finer particles are effectively intercepted by the tight structure of the inner layer.
5. The purified and clean liquid flows out from the center of the cartridge.

• Deep-Particle Capture: Particles are trapped within the multi-layered wound structure, not just on the surface. This maximizes filter life and minimizes change-outs.
• Exceptional Contaminant Retention: Designed to hold substantial amounts of debris before significant pressure drop occurs. This extends service intervals, reducing operational costs.
• Built Tough for Demanding Environments: Utilizing robust PP yarn or cotton/polyester (P/C) blend, these filter cartridges resist moisture and temperature fluctuations. PP construction specifically withstands exposure to acids, alkalis, and many solvents, ensuring reliability even with aggressive fluids. The P/C blend offers a cost-effective solution where extreme chemical resistance is less critical.
• Covering the Full Filtration Spectrum: Choose the right level of protection with nominal ratings available from fine 0.5 micron polishing up to heavy-duty 150 micron pre-filtration. Suitable for virtually any application requiring depth filtration.
• Optimized Flow Dynamics: Precise winding control (tension and density) ensures minimal flow resistance. Delivers high throughput while cutting energy costs.

• Power industry: boiler make-up water pre-filtration, cooling water filtration, seal water treatment.
• Chemical and petrochemical industry: process water filtration, solvent purification, catalyst recovery, API intermediate filtration.
• Electronics and semiconductor: primary filtration in ultrapure water preparation system.
• Food and beverage: clarification and filtration of syrup, edible oil, beverage water, brewing liquid.
• Pharmaceutical and biological engineering: pre-filtration or terminal filtration of process water, bottle washing water, culture medium and buffer solution.
• Metal processing: circulating filtration of cutting fluid, cooling fluid and cleaning fluid.

Flow vs. Pressure Drop of String Wound Filter

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